A) Lack of fresh air.
B) Poor quality of building materials.
C) Gas leakage in the kitchen.
D) The newly painted walls.
33.The word “accentuate”(Line 4, Para. 3)most probably means “________”.
A) relieve
B) accelerate
C) worsen
D) improve
34.Why were cracks in old houses not a big concern?
A) Because indoor cleanliness was not emphasized.
B) Because energy used to be inexpensive.
C) Because environmental protection was given top priority.
D) Because they were technically unavoidable.
35.This passage is most probably taken from an article entitled “________”.
A) Energy Conservation
B) Houses Building Crisis
C) Air Pollution Indoors
D) Traps in Building Construction
答案：31.D 32.A 33.A 34.D 35.B